Fish Passage Site 20300947

Coordinates (dec. deg.): 60.59944°, -149.54100°
Legal Description: S006N002W24
Region: South Central
Road Name: Seward Highway

Datum: NAD83
Quad Name / ITM: Seward C-7
AWC Stream #: 244-30-10010-2177-3063
Stream Name: Summit Creek

Elevation:

Site Comments: Channel one makes a 90 degree turn at inlet.

Multiple surveys have been conducted at this site — click on the drop down
arrow to the right of the survey date below to choose a different report for this site.

Survey KEN18-SCSH1

Observers: Maggie Harings, Alice Main

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert sagging in middle
  2. Sediment accumulation
  3. Improper bedding
  4. Culvert is poorly aligned

Comments: Culvert assessment and photos submitted by Kenai Watershed Forum. Very steep bank from highway to culverts. Scour at inlets. Culverts very poorly aligned. Site might be undersized for higher flows.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating:
 
Length(ft): 88.6
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 3
Approach Angle: 85.0
Sedimentation At Inlet: No
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):9.33 9.08
Height(ft):6.6 5.83
Apron Length(ft):
Water Depth(ft): 2.8
Rustline Height(ft):3.17
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.94
Culvert Gradient: 0.34%
Max Slope:
Max Slope Length:
 

Comments: This is culvert B on the Site Sketch. There is some substrate throughout culvert. Substrate depths not recorded. Water surface gradient thorugh culvert 1.48%. Not noted if culvert length is full bottom of culvert length or the length measured from the top of the miters.
ID: 2 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Green
 
Length(ft): 88.6
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 3
Approach Angle: 85.0
Sedimentation At Inlet: No
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):9.0 8.75
Height(ft):6.9 6.17
Apron Length(ft):
Water Depth(ft): 1.74
Rustline Height(ft):2.8
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.94
Culvert Gradient: 0.55%
Max Slope:
Max Slope Length:
 

Comments: Culvert has some sediment through barrel. Substrate depths not recorded. Water surface gradient through culvert 0.82%.
  Culvert Observations:
  1. Culvert sagging in middle
  2. Sediment accumulation
  3. Improper bedding
  4. Culvert is poorly aligned

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:BoulderCobble
Subdominant:CobbleGravel
Stream Slope(deg.):1.7
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 24.0 16.75
Downstream ordinary high water 42.0 18.17
Downstream ordinary high water 68.0 19.25
Upstream ordinary high water 32.0 13.20
Upstream ordinary high water 46.0 13.30
Upstream ordinary high water 65.0 13.60
Upstream ordinary high water 83.0 13.80

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 110.66
D/S Grade Ctrl (Thalweg) 0.00 95.79
D/S Water Surface Elev 0.00 96.63
D/S Thalweg 25.00 95.76
D/S Water Surface Elev 25.00 97.10
D/S Water Surface Elev 39.00 97.55
D/S Grade Ctrl (Thalweg) 39.00 96.40
D/S Thalweg (No outlet pool or tail water control at either culvert) 109.00 96.62
D/S Water Surface Elev 109.00 97.57
Outlet Invert (on substrate) 2 125.00 97.16
Outlet Invert (on substrate) 1 125.00 97.53
D/S Water Surface Elev 2 125.00 98.02
D/S Water Surface Elev 1 125.00 98.25
Outlet Culvert Top 1 125.00 103.25
Outlet Culvert Top 2 125.00 103.40
Inlet Culvert Top 2 213.60 103.70
Inlet Culvert Top 1 213.60 103.74
U/S Water Surface Elev 2 213.60 98.75
U/S Water Surface Elev (erroneous, likey 98.95) 1 213.60 96.95
Inlet Culvert Invert (on substrate) 2 213.60 97.01
Inlet Culvert Invert (on substrate) 1 213.60 97.07
U/S Thalweg (inlet pool max depth) 223.60 95.45
U/S Water Surface Elev 223.60 98.84
U/S Water Surface Elev 244.60 99.02
U/S Grade Ctrl (Thalweg) 244.60 97.65
U/S Water Surface Elev 306.60 100.25
U/S Thalweg 306.60 98.71

Notes:

  1. River distance is measured continuously throughout the survey reach along the thalweg of the stream.
  2. Measured from each end of the crossing along the thalweg of the stream.

Fish Sampling Efforts

Gear Type: Minnow Trap (A) Trap Duration(h): 4.3333335
Comments: Trap set about 80 feet upstream.
 
Gear Type: Minnow Trap (B) Trap Duration(h): 4.75
Comments: Trap set about 145 feet downstreamcd

Fish Observations

Species: juvenile/adult Dolly Varden Life History: Unknown
Total Fish Observed: 5 Fish Measured: 5 Fork Lengths (mm) Min: 89 Max: 140 Mean: 110
Collected/Observed by Gear Type: Downstream Minnow Trap (4)  Upstream Minnow Trap (1)  

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